부산대학교 도서관

Reducing emission of CO2 is the most important problem in the cement industry. And cement industry must contribute to recycling by utilization of industrial waste and by-products as raw materials or fuel. Recently, blast furnace cement has been noted for environmental loading reduction. This paper discusses the adsorption and the dispersion mechanism of comb-type superplastisizer having different molecular structure as the blended blast furnace cement.Using a control stress type rheometer（rotational cylinder viscometer）, the viscosity of the suspension was measured to estimate the apparent viscosity at a shear stress of 200 Pa. The absorbed amount of polymer calculated from the concentrations of the polymer in the initial solution and the liquid phase. The unabsorbed polymer concentration was measured by carbon analysis using a total organic carbon analyzer（TOC）.Comb-type superplasticizer having smaller amount of functional groups is adsorbed on BFS compared with OPC. And comb-type superplasticizer having larger amount of functional groups is adsorbed on both BFS and OPC. In the case of comb-type superplasticizer having larger amount of functional groups, the fluidity of cement paste was influenced by the replacement ratio of BFS. On the other hand, in the case of comb-type superplasticizer having smaller amount of functional groups, the fluidity of cement paste was not influenced by the replacement ratio of BFS. Therefore comb-type superplasticizer having smaller amount of functional groups could be suitable for blended cement.